OK guys so I rightly or wrongly want to repair graphics cards. To this end I bought three GTX 780ti off ebay as Spares or repair to see what I could learn.
They are different brands, one Palit Jetstream, one Gainward Phantom and a Gigabyte Windforce
I selected this model as faulty cards can be had quite cheap (around £20 each) and working ones hold a good resale value being one of the best cards that supports Winpows XP for retro gaming.
So out of the three I have two that don't detect at all and one that detects but gives no video output
I'm looking at the Palit first. This one does not detect by the BIOS. There is a problem with what I thought was an inductor L17 marked 'X' (but apparently it is a 12A fuse?) being open circuit.
I took some resistance measurements across the capacitors an the 12V input and low voltage ouput side of the VRMs , there is evidently a short somewhere.
The attached pics will describe this better than text I could write. The reistances marked 'high' are because I just see capacitors charging up so it is hard to get a proper reading
Does someone have experience of these cards to know what I am looking at here?
Are there any resources (board views, schematics or other info) that would help me?
Cheers
Rich
They are different brands, one Palit Jetstream, one Gainward Phantom and a Gigabyte Windforce
I selected this model as faulty cards can be had quite cheap (around £20 each) and working ones hold a good resale value being one of the best cards that supports Winpows XP for retro gaming.
So out of the three I have two that don't detect at all and one that detects but gives no video output
I'm looking at the Palit first. This one does not detect by the BIOS. There is a problem with what I thought was an inductor L17 marked 'X' (but apparently it is a 12A fuse?) being open circuit.
I took some resistance measurements across the capacitors an the 12V input and low voltage ouput side of the VRMs , there is evidently a short somewhere.
The attached pics will describe this better than text I could write. The reistances marked 'high' are because I just see capacitors charging up so it is hard to get a proper reading
Does someone have experience of these cards to know what I am looking at here?
Are there any resources (board views, schematics or other info) that would help me?
Cheers
Rich
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